The present invention relates to the technical field of Bluetooth earphones, and discloses a Bluetooth earphones case and the production process thereof, comprising a protective case body which consists of an upper cover and a lower cover, wherein the upper cover and the lower cover match, a connecting strap is arranged between the upper cover and the lower cover, the lower cover is made with a charging port at the bottom, arranged with a snap at the top of the front, and made with a placement slot inside, and the outside of the protective case body has anti-slip lines. The present invention solves the problems that the Bluetooth earphones cases in the prior art are inconvenient to use and prone to damage, so it is worthy of popularization and use.

A machining tool assembly is provided for machining a blank to form a firearm lower receiver. The assembly includes a pair of side plates positionable on opposed sides of the blank to capture the blank therebetween. A template plate having a template aperture is adapted to be removeably attachable to the side plates. The template aperture is aligned with a top surface of the blank and is adapted for machining a cavity within the blank having a peripheral contour complimentary to a peripheral contour of the template aperture. A centering mechanism is adapted to be removeably attachable to the template plate, with the centering mechanism including an opening aligned with a corresponding void formed on the blank to align the blank with the template plate.

A machining device includes: a positional deviation detection unit configured to calculate a correction value for correcting a positional deviation between an ideal contour line and an actual contour line in each of a plurality of angular directions based on a center of a hemispherical shape of a tool; a distance effect coefficient calculation unit configured to calculate a first distance effect coefficient indicating a degree of influence of the positional deviation when machining a second machining point, according to a distance between the tool and the second machining point in a case where a machining point machined by the tool transitions from one-point machining including a first machining point in the workpiece to two-point machining including the first machining point and the second machining point; and a positional deviation correction unit configured to correct the positional deviation of the tool.

A supporting device and method for a large thin-walled part is disclosed. The supporting device comprises a processing device and a supporting device. A workpiece is positioned between the processing device and the supporting device and is clamped at a periphery in a flexible clamping mode. A cutter in the processing device is connected with an iron core. A coil is wound on the iron core. When the coil is energized, a magnetic field is generated around the coil. A blade part of the cutter is in contact with a processing side of the workpiece. The supporting method combines the magnetorheological fluid technology with the jet supporting technology, and uses a jet impact force to offset part of a milling force. The current magnitude and winding mode of the coil are changed to control magnetic field intensity. The magnetorheological fluid is cured instantly to support the workpiece.

A supporting device and method for a large thin-walled part is disclosed. The supporting device comprises a processing device and a supporting device. A workpiece is positioned between the processing device and the supporting device and is clamped at a periphery in a flexible clamping mode. A cutter in the processing device is connected with an iron core. A coil is wound on the iron core. When the coil is energized, a magnetic field is generated around the coil. A blade part of the cutter is in contact with a processing side of the workpiece. The supporting method combines the magnetorheological fluid technology with the jet supporting technology, and uses a jet impact force to offset part of a milling force. The current magnitude and winding mode of the coil are changed to control magnetic field intensity. The magnetorheological fluid is cured instantly to support the workpiece.

A method includes machining a raw surface of a metal component to remove first native oxide from a metal base of the metal component to generate an as-machined surface of the metal component. A second native oxide is formed on the metal base of the as-machined surface of the metal component subsequent to the machining. The method further includes, subsequent to the machining, performing operations to generate a finished surface of the metal component. The operations include a surface machining of the as-machined surface of the metal component to remove the second native oxide.

A method includes machining a raw surface of a metal component to remove first native oxide from a metal base of the metal component to generate an as-machined surface of the metal component. A second native oxide is formed on the metal base of the as-machined surface of the metal component subsequent to the machining. The method further includes, subsequent to the machining, performing operations to generate a finished surface of the metal component. The operations include a surface machining of the as-machined surface of the metal component to remove the second native oxide.

A frictional drive railway wheel truing system comprising a master lift and drive arm spaced from a slave lift and drive arm extending from within a railway pit for lifting a pair of opposed railway wheels off railway rails. Each master and slave drive assembly comprising frictional drums to turn a railway wheel from a wheel flange. A master and slave lathe assembly moveable along an axis parallel to a rotational axis of the frictional drums; each master and slave lathe assembly having a cutting bit positioned to engage a tread and a flange of a railway wheel in a cut mode at a location superior to the contact area of said frictional drums and railway wheel; and a hold down device fixing rotation of a railway wheel to a predetermined axis during a wheel truing operation.

A method for machining a ceramic matrix composite (CMC), the method enhancing a machining speed for the ceramic matrix composite (CMC), includes: a step of scanning an irradiated portion of a surface of a machining target material by a laser head to irradiate the irradiated portion with laser light from the laser head, and forming a deteriorated layer on the irradiated portion of the surface of the machining target material; and a step of sequentially removing the deteriorated layer by an end mill, the deteriorated layer being formed on the irradiated portion, wherein the deteriorated layer is formed by heating the irradiated portion up to a predetermined temperature by irradiation of continuous oscillation laser light, and by forming a crack by irradiation of pulsed oscillation laser light.

A method for machining a ceramic matrix composite (CMC), the method enhancing a machining speed for the ceramic matrix composite (CMC), includes: a step of scanning an irradiated portion of a surface of a machining target material by a laser head to irradiate the irradiated portion with laser light from the laser head, and forming a deteriorated layer on the irradiated portion of the surface of the machining target material; and a step of sequentially removing the deteriorated layer by an end mill, the deteriorated layer being formed on the irradiated portion, wherein the deteriorated layer is formed by heating the irradiated portion up to a predetermined temperature by irradiation of continuous oscillation laser light, and by forming a crack by irradiation of pulsed oscillation laser light.